1.获取所有数据库名:
SELECT Name from Master..SysDatabases ORDER BY Name

2.获取所有表名:
SELECT Name from DatabaseName..SysObjects Where XType=‘U‘ ORDER BY Name
XType=‘U‘:表示所有用户表;
XType=‘S‘:表示所有系统表;

3.获取所有字段名:
SELECT Name from SysColumns WHERE id=Object_Id(‘TableName‘)

access :


如果表存在，如何得到这个表？
SELECT * from MSysObjects where name=‘ExamResultTime ‘ and type=1 and flags=0


//得到该数据库中所有的表名
SELECT name from MSysObjects where type=1 and flags=0

 

 

    1、获取所有用户名:   
    Select name FROM Sysusers where status=‘2‘ and islogin=‘1‘  
    islogin=‘1‘   :表示帐户   
    islogin=‘0‘   :表示角色   
    status=‘2‘   :表示用户帐户   
    status=‘0‘   :表示糸统帐户   
      
    2、获取所有数据库名:   
    Select Name FROM Master..SysDatabases orDER BY Name  
      
    3、获取所有表名:   
    Select Name FROM DatabaseName..SysObjects Where XType=‘U‘ orDER BY Name  
    XType=‘U‘    :表示所有用户表;   
    XType=‘S‘    :表示所有系统表;   
      
    4、获取所有字段名:   
    Select Name FROM SysColumns Where id=Object_Id(‘表名‘‘)   
      
    5、获取数据库所有类型:   
    select name from systypes   
      
    6、获取主键字段:   
    Select  name FROM SysColumns Where id=Object_Id(‘表名‘) and colid=(select top 1 keyno from sysindexkeys where id=Object_Id(‘表名‘))   
      
    7、获取表字段的基本信息:   
     程序代码   
    Select  
      字段名=rtrim(b.name),   
      主键=CASE WHEN h.id IS NOT NULL  THEN ‘PK‘ ELSE ‘‘ END,   
      字段类型=type_name(b.xusertype)+CASE WHEN b.colstat&1=1 THEN ‘[ID(‘ + CONVERT(varchar, ident_seed(a.name))+‘,‘+CONVERT(varchar,ident_incr(a.name))+‘)]‘ ELSE ‘‘ END,   
      长度=b.length,    
      允许空=CASE b.isnullable WHEN 0 THEN ‘N‘ ELSE ‘Y‘ END,    
      默认值=isnull(e.text, ‘‘),   
      字段说明=isnull(c.value, ‘‘)   
    FROM sysobjects a, syscolumns b   
    LEFT OUTER JOIN sysproperties c ON b.id = c.id AND b.colid = c.smallid   
    LEFT OUTER JOIN syscomments e ON b.cdefault = e.id   
    LEFT OUTER JOIN (Select g.id, g.colid FROM sysindexes f, sysindexkeys g Where (f.id=g.id)AND(f.indid=g.indid)AND(f.indid>0)AND(f.indid<255)AND(f.status&2048)<>0) h ON (b.id=h.id)AND(b.colid=h.colid)   
    Where (a.id=b.id)AND(a.id=object_id(‘要查询的表‘))  --要查询的表改成你要查询表的名称   
    orDER BY b.colid   
      
     程序代码   
    Select  
      表名=case when a.colorder=1 then d.name else ‘‘ end,   
      表说明=case when a.colorder=1 then isnull(f.value,‘‘) else ‘‘ end,   
      字段序号=a.colorder,   
      字段名=a.name,   
      标识=case when COLUMNPROPERTY(a.id,a.name,‘IsIdentity‘)=1 then ‘√‘ else ‘‘ end,   
      主键=case when exists(Select 1 FROM sysobjects where xtype=‘PK‘ and name in (Select name FROM sysindexes Where indid in(Select indid FROM sysindexkeys Where id=a.id AND colid=a.colid))) then ‘√‘ else ‘‘ end,      
      类型=b.name,   
      字段长度=a.length,   
      占用字节数=COLUMNPROPERTY(a.id,a.name,‘PRECISION‘),   
      小数位数=isnull(COLUMNPROPERTY(a.id,a.name,‘Scale‘),0),   
      允许空=case when a.isnullable=1 then ‘√‘else ‘‘ end,   
      默认值=isnull(e.text,‘‘),   
      字段说明=isnull(g.[value],‘‘)   
    FROM syscolumns a   
    left join systypes b on a.xusertype=b.xusertype   
    inner join sysobjects d on (a.id=d.id)and(d.xtype=‘U‘)and(d.name<>‘dtproperties‘)   
    left join syscomments e on a.cdefault=e.id   
    left join sysproperties g on (a.id=g.id)and(a.colid=g.smallid)   
    left join sysproperties f on (d.id=f.id)and(f.smallid=0)   
    --where d.name=‘要查询的表‘         --如果只查询指定表,加上此条件   
    order by a.id,a.colorder